NVIDIA interview questions

Applied online it takes 30 days and was contacted by a HR personally. A phone interview was scheduled. The guy on phone interviewed he was a mid level employee at the company. In the first interview question they ask me about my work experience after this they start talking about my CV. Then interviewer asked me first question and gave him answer but he expect different kind of answer except what i gave. That one only question he asked. After that he start talking about we are looking for candidate who know very good knowledge in 3D graphics as well as openGL, DirectX & other graphic api. I was really got confused about the job description what they mentioned and what they asked to me. Basically i applied for the VR developer position and it shifted to senior s/w Eng. dont know how? after that i received call from NVIDIA HR regarding profile has shortlisted.

I applied online and got feedback in 3 weeks. And then we scheduled for a phone interview, which lasts 45mins. We introduced to each other and did a coding question. I didn't receive any further feedback then.